ETSI ETR 084 TECHNICAL June 1993 REPORT Source:ETSI TC-TE Reference:DTR/TE-01017 ICS: 33.020, 33.040.40 Key words: Interactive services, multimedia, hypermedia Terminal Equipment (TE); Multimedia & Hypermedia Information Retrieval Services (M&HIRS) Investigation of candidate architectures for M&HIRS ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [email protected] Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16 Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. New presentation - see History box © European Telecommunications Standards Institute 1993. All rights reserved. Page 2 ETR 084:June 1993 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to "ETSI Editing and Committee Support Dept." at the address shown on the title page. Page 3 ETR 084:June 1993 Contents Foreword .......................................................................................................................................................7 1 Scope ..................................................................................................................................................9 2 References..........................................................................................................................................9 3 Definitions and abbreviations ............................................................................................................12 3.1 Definitions ..........................................................................................................................12 3.2 Abbreviations .....................................................................................................................13 4 Multimedia and Hypermedia Information Retrieval Services (M&HIRS) ...........................................17 4.1 General model of the service.............................................................................................17 4.1.1 Roles .............................................................................................................17 4.1.2 Model.............................................................................................................17 4.1.3 Service characteristics ..................................................................................18 4.2 Information characteristics.................................................................................................18 4.2.1 Content data level..........................................................................................18 4.2.2 Multimedia and Hypermedia Information level ..............................................18 4.2.3 Script level.....................................................................................................19 4.2.4 Application-specific level ...............................................................................19 4.3 Functional requirements ....................................................................................................19 4.3.1 Information producer requirements...............................................................20 4.3.2 Information manager requirements...............................................................20 4.3.3 Information consumer requirements .............................................................20 4.4 Technical requirements .....................................................................................................20 4.4.1 Information representation requirements ......................................................20 4.4.1.1 Constraints common to the different information levels ......21 4.4.1.2 Content data information .....................................................21 4.4.1.3 Multimedia and Hypermedia Information.............................21 4.4.1.4 Script information.................................................................21 4.4.1.5 Application-specific information ...........................................21 4.4.2 Information interchange requirements ..........................................................22 4.4.2.1 Real-time interchange .........................................................22 4.4.2.2 Non real-time interchange ...................................................22 5 State of the art...................................................................................................................................23 5.1 Information representation.................................................................................................23 5.1.1 Content data level..........................................................................................23 5.1.1.1 Text......................................................................................23 5.1.1.1.1 Techniques and quantities....................23 5.1.1.1.2 International Standards.........................24 5.1.1.1.3 Industry formats ....................................24 5.1.1.2 Graphics ..............................................................................25 5.1.1.2.1 Techniques and quantities....................25 5.1.1.2.2 International Standards.........................25 5.1.1.2.3 Industry formats ....................................26 5.1.1.3 Still picture ...........................................................................26 5.1.1.3.1 Techniques and quantities....................26 5.1.1.3.2 International Standards.........................26 5.1.1.3.3 Industry formats ....................................26 5.1.1.4 Audio....................................................................................27 5.1.1.4.1 Techniques and quantities....................27 5.1.1.4.2 International Standards.........................27 5.1.1.4.3 Industry formats ....................................27 5.1.1.5 Video....................................................................................27 5.1.1.5.1 Techniques and quantities....................27 5.1.1.5.2 International standards .........................27 Page 4 ETR 084:June 1993 5.1.1.5.3 Industry formats ................................... 28 5.1.2 MHI level....................................................................................................... 28 5.1.2.1 MHEG ................................................................................. 28 5.1.2.2 HyTime................................................................................ 30 5.1.2.3 HyperODA and ODA ........................................................... 31 5.1.2.4 Other Standards.................................................................. 32 5.1.2.5 Industry standards............................................................... 32 5.1.3 Script level .................................................................................................... 32 5.2 Information interchange .................................................................................................... 33 5.2.1 Real-time interchange................................................................................... 33 5.2.2 Non real-time interchange ............................................................................ 33 5.2.3 Open Systems Interconnection (OSI)........................................................... 34 5.2.3.1 OSI reference model and profiles ....................................... 34 5.2.3.2 Peer-to-peer concept .......................................................... 35 5.3 Technology........................................................................................................................ 35 5.3.1 Terminal equipment...................................................................................... 35 5.3.1.1 Personal computers, workstations, special devices ........... 35 5.3.1.2 Computing capabilities........................................................ 35 5.3.1.3 Extendibility ......................................................................... 36 5.3.1.4 Local storage....................................................................... 36 5.3.1.5 Multimedia presentation...................................................... 37 5.3.1.6 User interface...................................................................... 39 5.3.1.7 Networking .......................................................................... 39 5.3.2 Network structures........................................................................................ 40 5.3.3 Hosts............................................................................................................. 40 6 Architectures..................................................................................................................................... 41 6.1 Scenarios .......................................................................................................................... 41 6.2 Configurations ................................................................................................................... 44 6.2.1 Interchange configurations ........................................................................... 44 6.2.1.1